Over the last 5 months, Chris Hadfield, a Canadian astronaut, has been in command of the International Space Station. His regular videos, posted on the Canadian Space Agency website, feature the application of basic science in space exploration. His videos are typically created in response to questions on Earth, and with his easy-to-understand explanations, Chris has popularized science to a wide and diverse audience. His videos have been viewed millions of times and has earned him the title of "the coolest guy in outer space".

Now, Chris explains the importance of exercise in a weightless environment. On Earth, a proficient level of strength is required to partake in everyday activities such as walking and standing, but in a weightless environment astronauts lose muscle mass and bone density since no strength is required to support their weight. Astronauts lose about 1% of bone density per month in space and so finding ways to exercise is important to help combat this deterioration effect. Check out the following video to see how Chris deadlifts in space:

Today marks Chris' last day in space, as he prepares to return to Earth later this afternoon. I wish Chris all the best in the future and I hope he continues to be a steward for science.